Lock.



D. PANTAZI.

LOCK.

APPLICATION FILED OCT. 26. I9I5.

Patented Sept. 26, 1916.

i at New York, in the county and State of -New York, have invented newand useful En STATES-PATENT OFFICE;

um'rmos PANTAZI', or NEW Yomzy 1v. Y.

" Loox.

To allwhomz' mag/concern.' Be it known` that LTDIMITRIOS PAn'razI, a subject of the King of Greece, residing Improvements in Locks, of which the following is a specification.

This invention relates to improvement in locks and particularly to such types as are used in securing the doors of dwellings and the like against intrusion.

One of the objects is to provide a lock having two latch bolts, both retractable by" contact with the keeper in closing the door and also byV the use of a special key, both bolts being spring actuated although one may be secured in an inoperativeposition.

Another object isv to provide a lock of unusual simplicity of parts, cheaply constructed and so arranged as to be substantially unpickable.

These and other objects are attained by the novel construction and combination'of parts hereinafter described andv shown in the annexed drawing, forming part of this specification, and which Figure 1 is a plan view of a lock made in accordance with'the invention, shown .a locked position, .the cover plate being removed. Fig. 2 is a front view of the same.

Fig. 3 is another plan view but showing the bolts in a retracted position. Fig. 4 is a front view of the key barrel. Fig. 5 is a longitudinal section of the same. Fig. 6 isa transverse sectional viewv of the lock,

taken on line 6-6 of Fig. 3, Fig. 7 is a.

plan and end view of the key, and Fig-8 is a partial side elevation of the lock.

The construction includes a casing 10 'adapted to be inserted into the frame work Through` The rear end of the bolt 13 is pivotally engaged with a lever 15 fulcrumed near its centeron a pin 16, the opposite end of this lever being pivotally connected with a plunger 17 substantially parallel to the b olt 13, and having'a reduced portion on which Specification of Letters Patent. i

""is a coiled push spring 18'.- The reduced portion is bifurcated for a part of its length atented Sept. 26, 1916. Application med octobeas, 1915. serial 1615x969.

the prongs 19 receiving between them a pinl- 2O acting as a guide and also as an abutment for the spring l8'the'other end of which exerts its thrust against the plunger, thereby normally maintaining the bolt head 11 in 'an engaging position.

The inner end of the bolt 14 -hasa slot 21 in which is engaged a pin 22 set in the lever 23, pivoted at 24 and having lat its opposite end a. Vpivotally connected plunger 25,. having a-v bifucated end 26 between the parts of which is a xed pin 27, the plunger being forced rearwardly by this coiled push spring 28. Y i

lA lpair of dogs 30 and 31 are pivoted at 32, the cam faces of which are adapted to contact with the plunger 17 and lever 23 f respectively causing the bolts to be retracted. Pins 33 and34 are set in the upper surfaces of these dogs engageable with the fluted end of the key 35and it is to be i noted that if an improper key be insertedv it might engage with only one of the pins and fail to operate the lock.

The barrel 36 is made part of the casing cover 37 and contains two segments 38 and 39 having a space between them in which the key 35 enters.` Each segment has longitudinal ribs 40 and 41 preventing the entrance of a spurious or false key and both 'segments' are held in engagement by the lugs 42, in such manner as to be rotated by the spring 43 the thrust of which is op-v posed to the turning of the key 35, one end of the spring' being rigidly engaged within the casing 36 and the other end of the coil which surrounds the lower portion of both segments is -turned inwardly and enters a corresponding hole formed. in one of the segments 39, the construction being clearly indicated in Fig. 5.

-A pin 44 set in the segment 38 extends through a slot 45 in the barrel 36 limiting the rotary motion of both segments in accordance with'the movement of the dogs' 30 and 31.

The bolt 14 can be secured in an inoper.'

ative position by means of a pin 46 movable in the slot 47 formed through the casing 10 and insertible in the'bolt as shown. The outer end of the pin is engaged by a hinged lever 48 which may be secured by a detent4 so i 49 when it is desired to hold the bolt in a one of said bolts in a retracted position ir- 20 retracted position, the pin 22 at that time moving freely in the slot 21.

Having thus described the invention what I claim is :T- l.

l. In a lock, the combination with a casing and a pair of latch bolts movable therein, 'of means to maintain said bolts in a normally engaging position, dogs having independent operating means actuable by a key, a pivot common to both of said dogs i and means combined with said dogs for retracting said bolts.

2. In a lock the combination -With a casing and a pair of latch bolts movable therein, of a key .for retracting said bolts in unison, means for preventing the insertion of a false key, means for limiting the turning of said key and means for holding respective of the action of the other bolt.

3. In a lock, the combination with a casing and a pairof spring actuated latch bolts movable therein, of a key having a fluted surface, a barrel to receive said key, means combined with said barrel preventing the insertion of a false key, means for returning said barrel to its initial position uponl release of said key, said means sur rounding the lower portion of said barrel and dogs operable by said key whereby said bolts maybe retracted, said dogs having a common pivot.

DIMITRIOS PANTZI.

Witnesses:

CHARLIs K. KALMAN, ALEXANDER DENES. 

